[BUG] NumericValidationBehavior Not Working in .NET 8 Preview 7 When Using AppThemeBinding

[pvoelker]

Is there an existing issue for this?

• I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

• I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

The entry field with 'NumericValidationBehavior' is not turning the text field red when it is out of range or not a number.

Expected Behavior

In the provided example. I would expect the single entry field to turn red when the value entered is:

• Not an integer number
• Lower than 1
• Higher than 100

Steps To Reproduce

1. Run the application in debug in Windows
2. Enter the value '-1' in the entry. The field should turn red but it does not

Link to public reproduction project repository

https://github.com/pvoelker/NumericValidationBehaviorNET8Preview7Bug

Environment

- .NET MAUI CommunityToolkit: 5.3.0
- OS: Windows 11 Home (10.0.22621 Build 22621)
- .NET MAUI: 8.0.0-preview.7.8842

Anything else?

With my own experimentation, the issue seems to be with 'AppThemeBinding'. I had no problems using 'AppThemeBinding' with the valid entry text color style in .NET 7 MAUI. Once I updated to .NET 8 Preview 7, the validation stopped working.

If I change it to a static color (like 'blue') the validation works fine.

<Style x:Key="ValidEntryStyle" TargetType="Entry">
        <Setter Property="TextColor" Value="{AppThemeBinding Light={StaticResource Gray900}, Dark={StaticResource Gray100}}" />
</Style>

This could be an issue with MAUI in .NET 8 Preview 7. I figured I would start here first...

[VladislavAntonyuk]

We don’t support .net 8 yet. Although you can try the NuGet package from this PR: #1367. Does it solve the issue?

[pvoelker]

The issue for me is now moot since .NET 8 MAUI has other issues so I am sticking with .NET 7 MAUI for the time being. Thanks for the help on this

[mrwcjoughin]

Paul Voelker: have you retested on .net8.0 RC2?

…

On 25 Oct 2023, at 05:03, Paul Voelker ***@***.***> wrote: The issue for me is now moot since .NET 8 MAUI has other issues so I am sticking with .NET 7 MAUI for the time being. Thanks for the help on this — Reply to this email directly, view it on GitHub <#1389 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACOGERTXU34JD4XX5RUZPOLYBB6RPAVCNFSM6AAAAAA4MS4VLCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONZYGQZDSNZVGQ>. You are receiving this because you are subscribed to this thread.